# s1 = {1, 2, 3}
# print(type(s1))
# print(len(s1))

# l = [1, 2, 3, 3, 3, 2, 4, 3]
# print(set(l))
# print(list(set(l)))

# s3 = {1, 2, 3}
# print(s3)
# s3.add(4)
# print(s3)
# s3.update({3, 4, 5})
# print(s3)
# ret = s3.remove(2)
# print(ret)
# s3.discard(2)
# print(s3)
# s3.pop()
# print(s3)

# s1 = {1,2,3,[4,5]}